Financial Instruments (Details 3) - USD ($) $ in Thousands	Jun. 01, 2019	Mar. 02, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	$ 2,611	$ 2,015
Municipal and corporate bonds	601	402
Commercial paper	4,500	300
Total cash equivalents	7,111	2,315
Municipal and corporate bonds	11,699	12,030
Total assets at fair value	19,411	14,747
Quoted Prices in Active Markets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	2,611	2,015
Municipal and corporate bonds	0	0
Commercial paper	0	0
Total cash equivalents	2,611	2,015
Municipal and corporate bonds	0	0
Total assets at fair value	2,611	2,015
Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	0	0
Municipal and corporate bonds	601	402
Commercial paper	4,500	300
Total cash equivalents	4,500	300
Municipal and corporate bonds	11,699	12,030
Total assets at fair value	$ 16,800	$ 12,732